8440394 has 8 divisors (see below), whose sum is σ = 12710628. Its totient is φ = 4203520.

The previous prime is 8440391. The next prime is 8440423. The reversal of 8440394 is 4930448.

It can be written as a sum of positive squares in 2 ways, for example, as 8439025 + 1369 = 2905^2 + 37^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8440394.

It is not an unprimeable number, because it can be changed into a prime (8440391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7697 + ... + 8724.

Almost surely, 2^8440394 is an apocalyptic number.

8440394 is a deficient number, since it is larger than the sum of its proper divisors (4270234).

8440394 is a wasteful number, since it uses less digits than its factorization.

8440394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16680.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 8440394 is about 2905.2356186719. The cubic root of 8440394 is about 203.6045942124.

The spelling of 8440394 in words is "eight million, four hundred forty thousand, three hundred ninety-four".